2781642317 has 2 divisors, whose sum is σ = 2781642318. Its totient is φ = 2781642316.

The previous prime is 2781642211. The next prime is 2781642343. The reversal of 2781642317 is 7132461872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2256820036 + 524822281 = 47506^2 + 22909^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781642317 - 2¹² = 2781638221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781642397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390821158 + 1390821159.

It is an arithmetic number, because the mean of its divisors is an integer number (1390821159).

Almost surely, 2^2781642317 is an apocalyptic number.

It is an amenable number.

2781642317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781642317 is an equidigital number, since it uses as much as digits as its factorization.

2781642317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 2781642317 is about 52741.2771650441. The cubic root of 2781642317 is about 1406.3727024798.

The spelling of 2781642317 in words is "two billion, seven hundred eighty-one million, six hundred forty-two thousand, three hundred seventeen".